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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88860eacc44fffdcd609da96a7f630f11c020d1b8bc9269b4931ddbf4c5eda26' 
  AND token = 'ns7o8rar9ONZZWxBG+ud2DYDB6T5+gATlAkKTZIgEeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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