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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9037a9d0f31ac63b3123746ceedd1311e11f379643db8300ef04f5ec35a3dcf1' 
  AND token = '1+h7oQds95nMnlFAlESrt/gXktMDtz0KXv3Rg5am6/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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