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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0392656d712600531353da729f39b1eca6c542fced7ca7b796ca09527f16fa1d' 
  AND token = 'E2J50jAQYDm7tc2zLE6no1G/Kiy+FdKuprCXDJQM6OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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