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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f3091bdeaadf855829ec23b01e6682b132c08826674f4028235cb2bc5046bc' 
  AND token = 'fKVatuWQd2uejrTjH1aaEhyPmrsZcJ5SZyADEjtL5N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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