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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b372396a49de32e0ac1166c92bc452894e69933156e1882d7fc73b706c62526' 
  AND token = '1J7kf94spcdDXaJWqTJFH4Ht49h8IE9Gs80eKpr6Otw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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