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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce024b4e6091ed25dbca7a74620639ce57d3081a42239a6e48cff75ae356df9f' 
  AND token = 'ousnO4U9Nz6/Hpbz1cr5DDs69Pyb1VasXLxrqlc7gio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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