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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c34f4581b261cdd76eb6d0ba1f2e82c97ed5f05f3dad982e168f3995e3b9834' 
  AND token = 'bOT1dW7eujOUBjNrEbBO5r6EzgkKXRHaOsS2G2a16Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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