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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650db3f49ee8cfdba33fb3c6a1339359895ff6713435666a6e0c4f8a6919135b' 
  AND token = 'hsTef7XuwnLX94Apwn3Cysc6Wx4fLC69F8MlPTLGAiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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