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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b65ff8ed693d471259c10280887dfc8157c95450f1a1082a666000e1f5d727' 
  AND token = 'otuDVpW2sZbzukx+sHGGtlZ8CRFzHuW3La6CWX90Irw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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