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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb9d9922daa45b70b52eee0ee1a7c2fbd1b18fb64b819935181feb48ef9147a' 
  AND token = 'ufFk3q+r+SOiY6GL7wbEgd8oSvFb2KdvtQ/ai/cuuQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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