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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c0efb63518fd3a0ba18308713bca3b7aacb4ddaff7fa781a1f78526739f37ed' 
  AND token = 'DkdS5o3RTHuKUHJwrYGR3T5JGR2Z5Kfz1BKW9i0d4CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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