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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910e85e328a6173aafb423d9109d70d953538a3c4c9035818a788f6238d8c55a' 
  AND token = 'g64AGdBPNWa6lolZBW05mq9unNbXi77xZpKn64YKz1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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