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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d5c0e69589c18b99873984484651561858240e942b2771a4978fdadaab02c8' 
  AND token = 'lH3uiMTfrgluDBdLBzzoqaMrEB4B4R2Bil/rd/3fmv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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