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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaacdd85d13b2e93dd6890617f22691470fcbe7e78e2429decbfb69e5ea4ad9d' 
  AND token = '3bPrPd1SEaSUp/pZNMc/0O1faO/k3TCO2XZsZmbFAVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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