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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8671f3053fa10f23e0f9ec09843a4a0e33ab5addee55981b22abd51206defcd1' 
  AND token = 'f8TIOj5boJTygbPEsgI7flwS7+R+j2EhudssrdpmOs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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