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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6082377b3651ffdbf77f6050eeaf949818158c31cd5989c2391e55d37aeab5c6' 
  AND token = 'wTv8o8T00lWWu0rhw4ShWDt2K0RBZg0re9xcMNs/5iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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