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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3583d7d66d79997543dd9401d7c8a0869b41e49475eb1abebd935bd860cc227' 
  AND token = 'bLDrGsS9XBoPeoNPPnV5rRLNxDut8R+O7/+bwgiyhUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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