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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b85688a5a9fd7a5f3dc8d5bb166d719972a51ffd7c47bb97aabc6931be0dc62b' 
  AND token = '7D2gORs04Ub/336l3w5ST16Nb69ozRrL4X8ozGE6HvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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