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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb962cd7f604b134c627eea89cea8a67133073a87bda42fd5116117c77d71cf' 
  AND token = 'X6EkoNsVAxL7yRuE12XRHA1ArUmLi4acs9hhaabghLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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