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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d675f048eea34ac911a511ff688b2ca0a12eab6aa77ae9cf72c19ba639ac83' 
  AND token = 'aUk+b2KFcKo5c3SLNCmmR238+AXqKEYO/8F8o2QXA6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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