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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a0a09adb29dfef74742133403895ed634235de1fe3639a364584c82861e496c' 
  AND token = '1khrx8BLkHVqEKCaKK27/8SA3qrsI7rkC/JgbeYxEQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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