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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd44a9a32f73c92764e4f35951ac904a8fd13ffd49693dcf797b24c76c1bb40de' 
  AND token = 'LEFR5zNeHEPoU7/JAX/pGMoRa8/Ec7tCKeGrIPHFzkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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