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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e10d4dc127f668fc7d48b671b86f766c8084ea4d36ad0cc4a54af2d06f308df8' 
  AND token = 'fCRHp8toeq7stPf0qoDaS2Sx0dpKkRCcTkF2m97S+rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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