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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '256c4937789149a28febb27a0fa7b5b71147f6f029b7f8b394404da79ddf1500' 
  AND token = 'Md4BniZbmjGgAdjZ7Uac3xHIF6U/URW6d7e7gNn4B9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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