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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad8d49f029d36b38928296d59cc72c32f5954c262c54ce6de2cbfe27143aab3' 
  AND token = '+55PD4s5FEdMuzrrLfnYYbLsfdxRQISZKCVfBJ7GMAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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