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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5c81edb3c92afe49084771fa8355ee89997809c61d941c02acd433708267bb' 
  AND token = '5+sKqAuqv4fp+WBO0YI2Z/12I7vJISc/wFwkNw3fePw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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