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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af241beee5da409e5465530149aa12e6fdca0a8e36e6747038f6b050613bc6b4' 
  AND token = 'rgf1v3+mcxdwVJZvTEoU6BGIRSfSKejFt4DM+CNiPSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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