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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78160591891e70d7e4397c6e0499f1c1d59c4dbe7ec7f64802c0695b25fc4ee7' 
  AND token = '+xNwY+AE3qAihLfxnfjTcFLGve6QyNj6Dp0GwYuQc58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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