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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be57eb86ec96631deb301dd87ee4aea21162cedf7c3e827645aabfa67b0b2e8' 
  AND token = 'Eagt5nHdk2Smd6wotKZMcyvcy3RP7rThsIZKqOCc55I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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