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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4af2f518775e7178387f68b66148d9c53e65af5f0a1a824232d1aa680d14dae4' 
  AND token = 'LXA+67aoFHzIA6zZgsaYQ//pJwfXSiz7XS19ovM+e5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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