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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ade79e9e4f154045a07376efe64e0a65f2ea39f7a50e25c5f934b3485ef473e' 
  AND token = 'gpuS5iXu8A+zgxv4ww1QwMYxzK7PTJx+xK+8UCGXpos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}