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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0308c1cb37b00904c6d43a82be8154e4f3eb7c3d8b215c157bd9859260da5e07' 
  AND token = 'SL6ERL7l6AVDqGH4WLWKm7SQp4ntBmHYxf9N3BvK7nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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