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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28398a95e6869a2fe6dfc62a671a1ef1d766f3e18c434fa2306c76a4a60fb845' 
  AND token = 'bmqWnkzuo9SJLewKb05d+4TotKbLKZNtW1ejHflmi3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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