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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd7408fce6701818a04e0ca2a724462cb6ec1b1638e7b95433c4a35e4adcaac' 
  AND token = '0gJ8KD9wCpDQV9J1vBK3+bjrdEsgKyveyd9K6hOtelU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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