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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ccaf6803bbf187f4704885f03a06381a29d2654a8ab78817d978b1ec94951ed' 
  AND token = 'TMljM1KE7J+O7ljRaDFF21i7c/i9nWqXdXy3DjbRvPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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