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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d99567fc3414b011c7ae75c5d54c29cf68c2a72582a0f165543f465bfeb839' 
  AND token = '3lc1O+5RmsXkVFPOOlrcMdU/BIC03gb23YWP/l99m3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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