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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e82ada1505e83919dbbd298d540c52a939bc3d007c1d2c520a6e6f1696333e' 
  AND token = 'E9nD7O446XhxDUF3jXyC/nd3TGV1Rs+DiKlE1ln+qIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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