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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a250f1df3562701e2d11adcf32b9d0e800dd1a0d2f30226383e76c8a25ce614' 
  AND token = 'Riad7ot2x9AOg/0eOa14l0r/xNhEUuB54Lk4F8xgCQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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