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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b7f9e7d1b2e4ac96ad4868233e0c805c0ccf3080b1e0587d7b63993f455024' 
  AND token = '3h0E5jVRHjXzDgbl2oTDPbx5Nsu4JVFg6MxTA8M1ESk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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