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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee020d22644d14171d6dc0f7f02c1de02597852ba84544cc17cf51b7cfb29d9' 
  AND token = '0rxktTeB/DsJ1Uh/QlHoXD/662AsqkN3TKvoQzWss6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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