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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab2d3ce75c0aaa05abc1eed8e4c7fe78b2c414f407d1363ba0969744977a906' 
  AND token = '/T0aByReDKPR+Q+goaFeX+o3YxVrcePT3BUqvAilRAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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