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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee606fddc4605ffbdd2157f9c09145a39de1e2aa58a31bacdc5fdd4e5c2e392' 
  AND token = '+RpN4D6lgKTIxy7WCZ/9XbyzaFpt9jSLMYSd3RUT/G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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