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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98555f5e3d37722a59bb0cf348ed9a27c7f4e976d6f76dd2e62d6a080ae9ee99' 
  AND token = 'rtuVii7hT9A7JNLidrAQQs8dlDeaO9BZNkabB/slhCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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