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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b95225a3c106f6710e5e1b53ac347dd18374be621a8b6caa133f9f7bf4428a2' 
  AND token = 'mt5U1cXRHruPYgrGLiha9VscW/rzimt7VNR1kVEo4qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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