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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840a344ba8d3a0f7f79a3491fa2a82d80ed507ce1d7bcbcbe279717c367d0575' 
  AND token = '9L8ie2P/hwXS4p0+v0FnKgPBQ3HnD0SaznSwryAfs/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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