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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0305e2bb78028d5bab2e69873937966e0cc9f115146ebdbd0dd078dede4e2ca' 
  AND token = 'ceZMktD9MWxT7fwOjFgu+5BmRv0ZDMkeH5QEKLx2LFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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