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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbcdb80f3614ad2dc9be796549f29fc0ceeaebb85fe620a6d957380c7ed9f59a' 
  AND token = 'kQ2cB3+7c0C0+B3WGlrTKPGjuylWP2TYFsAwBj8JAAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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