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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '603b959c65809c22f565cb19164252f5fa27cbf7c86fa1d8e1b73b89136de45e' 
  AND token = 'Bb3UGXiBWcb4bBINGFwEOTbvNEGWI0csY8aXK7fXK5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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