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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710f153e55efc03be4c4e430e4036653fbdaccc80cee00dcd02f88b3f1de1aeb' 
  AND token = 'jeiI6CBh6oeMu2BTinYUGA61peUy5t78EMdI0W1fMaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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