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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4978f1d7ff55a6a5120b095f7d86e61588fce088f67be8b0f1c9e0b9adfcf9ee' 
  AND token = 'HzVOfp+fjPp7pwHdl+Y83xENpGVFoP4PCMHJ3Nyk1fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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