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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9697e5b79a1ed0a1672dfabf6164f01a58da3a02569c95e8d6d0db14ab6ec755' 
  AND token = 'a28hNYWSZ0IV/rhXrjANWG2t3PmWDOfl/itmgJ/XX5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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