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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c8e5269cc3d215c4a947e2a86d0ae89f65a2c26a490f89bab0eb5b3cf3eb82' 
  AND token = 'JnyIiR53nK5SSd9zb88ZZlVFYVlGSH/bB8lGPpqC6tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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