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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3607c905afa611739574945e9f1a33f2d5baedd518fc4417f032adafc6d38e40' 
  AND token = 'rw1Gi9QpBMHlSWM0i/ypeUL048nPLNRyTODqHivgyr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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