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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230916b11187200771deabcf26fcf9e0a20263c3a33a2b5daee23a02ba14b4bd' 
  AND token = 'D1/ipbtD/wzdJWmh6pb85+qXO4G61j7tK/1Sm8wIhl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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