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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e87a6b97d2519ab9f21e8ff54b60512bdff4f48b83a0c8bd65b301dcf28128' 
  AND token = '4p92GTWcWoRqI2EQAzUyb5JkjV8skEmjz524S/VP9Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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