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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04405db2add179b14c83cd21e795028b086e2883b61f22db7e70e179d19ccc85' 
  AND token = 'P9LWcMR2p7qiR7LDB0/t+F/MwPAUcVIU2gd+ZCeX4Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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