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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eaef3b08ec8b1b1b376dc21397317c6372d1e761d38d363891daa6570b5a72a' 
  AND token = 'KWArit88BP9X8/zd6aKPIhP5g4o+T1OdQgC5ijFeOvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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