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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090f90f129eed2b4b7389ffa2980b18a48e5a187117756d82adda2def6878988' 
  AND token = '4iI4lbDLAB4s1HR67vdKtyKQksYtkecdJSu49R/ovPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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