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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8480a52079e4894cfa730b3f2785de6ccd67ce66bcb8717fd8fdd1d5e7fb5a95' 
  AND token = 'FnfrWeYiGFXq55iUsP6dK+uxci9x+A/9vLfeYoQoH2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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