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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531c3624fa0a2dbb4d0f7783873e250c25bbcbde42e0f8a4c963c2a73c11682c' 
  AND token = 'nQJwB2EAdMfQIBThm8nzhSL2Pmyrr6UO43HHBL8mx+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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