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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82442d27e469ca66af415c572fbcaba06507bb737418be7ed63bf8c2e6396c66' 
  AND token = '/h7x1Mr0fxsC/cGd/bJFgB09pY4McNFvz+UvN60cJmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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