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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca2dc5b9ac163295c64dbfc39ca842dfeccf95b57af60a3c2ede6beecebd545e' 
  AND token = '7QI+qqn9vFMxWbHweJCoUZq/QZye4zNUr+qsMlRao5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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