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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34cd0120cd961969ae3a0d3566786ffa9414d2f11b75f9d23997257cf742d880' 
  AND token = '8XxkpoRFzmO3BjFOcZ2pbSMA9MZN+HBySWQE7EyZVN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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