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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36043eb7a2253842f9f8766b4f21dc23bc87e37d2612b2f4207c8f9380e8a358' 
  AND token = 'yLbRXIrRxUdhtmn8rCGkgdNj+zAEQ9wXgACFI82pVnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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