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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98004396b0d9777a6689cdfd4b4c0c9d0da0444cd576ffccb9a818b63db7f65' 
  AND token = 'G/FoIVPmwpIbNITVWtybi2JEeWuWhhJ+kCyoLrUgM4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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