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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbee507cd190215730ffd5d9153f4d7f670e7977eeb8b5067fc3d3aa5c41b5ef' 
  AND token = 'RKLICQd2HPugQrRCsiTIE3KMPBaG4LFYk1d5S6ceRqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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