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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93e2a4b67fcc2663f57b7b7e31f1739db40dbc2e707ee55b7649c77fa816aff' 
  AND token = 'fULAH1vemy+gCSm7EVhZi+pATkkPMCCLgwUybpb04uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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